/**
 *
 */
package com.samtech.security.service;


import org.apache.commons.lang3.StringUtils;
import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.AuthenticationInfo;
import org.apache.shiro.authc.AuthenticationToken;
import org.apache.shiro.authc.SimpleAuthenticationInfo;
import org.apache.shiro.authc.credential.HashedCredentialsMatcher;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.authz.Permission;
import org.apache.shiro.authz.SimpleAuthorizationInfo;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.session.Session;
import org.apache.shiro.subject.PrincipalCollection;
import org.apache.shiro.util.ByteSource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.samtech.commons.Encodes;
import com.samtech.commons.SessionUtils;
import com.samtech.security.UserService;
import com.samtech.security.shiro.session.SessionDAO;
import com.samtech.web.vo.IUser;

import javax.annotation.PostConstruct;
import javax.inject.Inject;

import java.io.Serializable;
import java.util.Collection;
import java.util.List;

/**
 * 系统安全认证实现类
 *
 * 
 */
@Service
//@DependsOn({"userDao","roleDao","menuDao"})
public class SystemAuthorizingRealm extends AuthorizingRealm {

    private Logger logger = LoggerFactory.getLogger(getClass());
    public static final String HASH_ALGORITHM = "SHA-1";
    public static final int HASH_INTERATIONS = 1024;
    public static final int SALT_SIZE = 8;
    
    //private SystemService systemService;
    @Autowired(required=false)
	private SessionDAO sessionDAO;
    @Autowired(required=false)
 	private UserService userService;

    public SystemAuthorizingRealm() {
        this.setCachingEnabled(false);
    }

    /**
     * 认证回调函数, 登录时调用
     */
    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken authcToken) {
        UsernamePasswordToken token = (UsernamePasswordToken) authcToken;

        int activeSessionSize = getSessionDao().getActiveSessions(false).size();
        if (logger.isDebugEnabled()) {
            logger.debug("login submit, active session size: {}, username: {}", activeSessionSize, token.getUsername());
        }

        // 校验登录验证码
       /* if (LoginController.isValidateCodeLogin(token.getUsername(), false, false)) {
            Session session = SessionUtils.getSession();
            String code = (String) session.getAttribute(ValidateCodeServlet.VALIDATE_CODE);
            if (token.getCaptcha() == null || !token.getCaptcha().toUpperCase().equals(code)) {
                throw new AuthenticationException("msg:验证码错误, 请重试.");
            }
        }*/

        // 校验用户名密码
        IUser user = getSystemService().getUserByLoginName(token.getUsername());
        if (user != null) {
           /* if (Global.NO.equals(user.getLoginFlag())) {
                throw new AuthenticationException("msg:该已帐号禁止登录.");
            }*/
            byte[] salt = Encodes.decodeHex(user.getPassword().substring(0, 16));
            return new SimpleAuthenticationInfo(new Principal(user, token.isMobileLogin()),
                    user.getPassword().substring(16), ByteSource.Util.bytes(salt), getName());
        } else {
            return null;
        }
    }

    private SessionDAO getSessionDao() {
		return sessionDAO;
	
	}

	/**
     * 获取权限授权信息，如果缓存中存在，则直接从缓存中获取，否则就重新获取， 登录成功后调用
     */
    protected AuthorizationInfo getAuthorizationInfo(PrincipalCollection principals) {
        if (principals == null) {
            return null;
        }
     
        AuthorizationInfo   info = doGetAuthorizationInfo(principals);
         return info;
    }

    /**
     * 授权查询回调函数, 进行鉴权但缓存中无用户的授权信息时调用
     */
    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principals) {
        Principal principal = (Principal) getAvailablePrincipal(principals);
        // 获取当前已登录的用户
       /* if (!Global.TRUE.equals(Global.getConfig("user.multiAccountLogin"))) {
            Collection<Session> sessions = getSystemService().getSessionDao().getActiveSessions(true, principal, UserUtils.getSession());
            if (sessions.size() > 0) {
                // 如果是登录进来的，则踢出已在线用户
                if (SessionUtils.getSubject().isAuthenticated()) {
                    for (Session session : sessions) {
                        getSystemService().getSessionDao().delete(session);
                    }
                }
                // 记住我进来的，并且当前用户已登录，则退出当前用户提示信息。
                else {
                	SessionUtils.getSubject().logout();
                    throw new AuthenticationException("msg:账号已在其它地方登录，请重新登录。");
                }
            }
        }*/
        IUser user = getSystemService().getUserByLoginName(principal.getLoginName());
        if (user != null) {
            SimpleAuthorizationInfo info = new SimpleAuthorizationInfo();
           /* List<Menu> list = UserUtils.getMenuList();
            for (Menu menu : list) {
                if (StringUtils.isNotBlank(menu.getPermission())) {
                    // 添加基于Permission的权限信息
                    for (String permission : StringUtils.split(menu.getPermission(), ",")) {
                        info.addStringPermission(permission);
                    }
                }
            }*/
            // 添加用户权限
            info.addStringPermission("user");
            // 添加用户角色信息
            /*for (Role role : user.getRoleList()) {
                info.addRole(role.getEnname());
            }*/
            // 更新登录IP和时间
            //getSystemService().updateUserLoginInfo(user);
            // 记录登录日志
            //LogUtils.saveLog(Servlets.getRequest(), "系统登录");
            return info;
        } else {
            return null;
        }
    }

    @Override
    protected void checkPermission(Permission permission, AuthorizationInfo info) {
        authorizationValidate(permission);
        super.checkPermission(permission, info);
    }

    @Override
    protected boolean[] isPermitted(List<Permission> permissions, AuthorizationInfo info) {
        if (permissions != null && !permissions.isEmpty()) {
            for (Permission permission : permissions) {
                authorizationValidate(permission);
            }
        }
        return super.isPermitted(permissions, info);
    }

    @Override
    public boolean isPermitted(PrincipalCollection principals, Permission permission) {
        authorizationValidate(permission);
        return super.isPermitted(principals, permission);
    }

    @Override
    protected boolean isPermittedAll(Collection<Permission> permissions, AuthorizationInfo info) {
        if (permissions != null && !permissions.isEmpty()) {
            for (Permission permission : permissions) {
                authorizationValidate(permission);
            }
        }
        return super.isPermittedAll(permissions, info);
    }

    /**
     * 授权验证方法
     *
     * @param permission
     */
    private void authorizationValidate(Permission permission) {
        // 模块授权预留接口
    }

    /**
     * 设定密码校验的Hash算法与迭代次数
     */
    @PostConstruct
    public void initCredentialsMatcher() {
        HashedCredentialsMatcher matcher = new HashedCredentialsMatcher(HASH_ALGORITHM);
        matcher.setHashIterations(HASH_INTERATIONS);
        setCredentialsMatcher(matcher);
    }

//	/**
//	 * 清空用户关联权限认证，待下次使用时重新加载
//	 */
//	public void clearCachedAuthorizationInfo(Principal principal) {
//		SimplePrincipalCollection principals = new SimplePrincipalCollection(principal, getName());
//		clearCachedAuthorizationInfo(principals);
//	}

    /**
     * 清空所有关联认证
     *
     * @Deprecated 不需要清空，授权缓存保存到session中
     */
    @Deprecated
    public void clearAllCachedAuthorizationInfo() {
//		Cache<Object, AuthorizationInfo> cache = getAuthorizationCache();
//		if (cache != null) {
//			for (Object key : cache.keys()) {
//				cache.remove(key);
//			}
//		}
    }

    /**
     * 获取系统业务对象
     */
    public UserService getSystemService() {
       return userService;
    }

    /**
     * 授权用户信息
     */
    public static class Principal implements Serializable {

        private static final long serialVersionUID = 1L;

       // private Long id; // 编号
        private String loginName; // 登录名
        private String name; // 姓名
        private boolean mobileLogin; // 是否手机登录

//		private Map<String, Object> cacheMap;
        //User user
        public Principal(String loginName,String name, boolean mobileLogin) {
           // this.id = id;
            this.loginName = loginName;
            this.name = name;
            this.mobileLogin = mobileLogin;
        }

       public Principal(IUser user, boolean mobileLogin2) {
    	   this.loginName=user.getUsername();
    	   this.name=user.getName();
    	   this.mobileLogin=mobileLogin2;
       }

	/* public String getId() {
            return id;
        }
*/
        public String getLoginName() {
            return loginName;
        }

        public String getName() {
            return name;
        }

        public boolean isMobileLogin() {
            return mobileLogin;
        }

//		@JsonIgnore
//		public Map<String, Object> getCacheMap() {
//			if (cacheMap==null){
//				cacheMap = new HashMap<String, Object>();
//			}
//			return cacheMap;
//		}

        /**
         * 获取SESSIONID
         */
        public String getSessionid() {
            try {
                return (String) SessionUtils.getSession().getId();
            } catch (Exception e) {
                return "";
            }
        }

        @Override
        public String toString() {
            return loginName;
        }

    }
}
